— You must keep the door _______ when you leave your room. — But I want to get the fresh air. I think I can keep the window ________ instead. 

Mr. Smart’s job is _______. 

 –Is Lucy or Lily the ______ of the twins?--Lucy. She was born half an hour earlier.

Liu Xiang is ____ popular ____ many students are talking about him in and out of school. 

Please throw the food away. It smells         .